What are the factors that lead to the cracking of orange fruit? How to remedy orange cracking?

If there is little rain (or irrigation) for a long time, most orange orchards in our province are located in hilly areas, with poor irrigation conditions and uneven distribution of rainwater. There is always a long drought in summer and autumn, and citrus trees and fruits are short of water. Long-term drought and lack of rain will make the root system absorb water, and the fruit moisture will grow faster than the peel, making the peel thinner, especially the lack of water and potassium. The environmental conditions of orange orchard are not good, the original soil layer is shallow and the root system is shallow. In case of drought, the roots will be thin. The difference between varieties is usually that the citrus varieties with thin skin and early maturity have serious fruit cracking. According to the investigation, the fruit cracking rate of Nanfeng orange with thin skin is 44%, that of Miyagawa orange with early maturity is 34%, and that of Satsuma mandarin with middle and late maturity is 10%.

The imbalance of phosphorus and potassium nutrition in trees and the problem of navel orange cracking were analyzed. It was found that the content of phosphorus in the pericarp of cracked fruit was higher than that of normal fruit, which made the pericarp thinner and cracked fruit increased. This is the result of applying more phosphorus and less potassium. The disease is repeatedly sprayed with canker, and the fruit that is sprayed many times in summer cracks. The fruit ripens, the peel becomes thinner, the pulp becomes softer, the sugar in the juice continues to increase, the water is absorbed quickly, the fruit expands and the fruit cracks. Fruits with high phosphorus content are easy to crack due to improper fertilization. The soil moisture changes seriously, the trees are fragile, and the citrus fields with shallow roots are easy to crack. In summer drought and shower weather, pulp absorbs water and expands rapidly, causing cracks. The orchard soil is acidic, the calcium content decreases and the skin becomes thinner. Cracks are also easy to occur in the case of uncoordinated supply of fertilizer and water.

Comprehensive management and cultivation measures should be implemented in every development period of citrus, specifically in two aspects: fertilizer and water. The key is to implement it in planting management, so as to reduce cracks. Applying high-quality organic fertilizer can improve soil fertility, enhance the growth momentum of trees and promote the balanced and coordinated development of pulp and peel. High cell wall density, high pectin content and high peel softness can reduce the occurrence of cracks. In winter, magnesium 3 15, a bio-organic fertilizer with excessive medium and trace elements, can be selected. This fertilization scheme is helpful to coordinate the supply of organic fertilizer and inorganic fertilizer, and to balance the momentum of strong trees.

In the development stage of fruit expansion (germination in late summer), the root system should catch up with potassium, calcium and other elements, mainly organic fertilizer. Beauty nose 800 times/near home improvement organic water, dragon fat 300 times leaching.